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The lower zoœcium contains a mature free statoblast, the upper one a fixed one.

I have, however, seen only one instance of this premature development, in a single statoblast contained in a small zoarium of P. fruticosa found in Lower Burma in March.

Swim-ring A ring of polygonal air-spaces surrounding the statoblast.

The most definite character in which this species differs from F. sultana and F. australiensis is the ornamentation of one surface of the statoblast, both surfaces of which are smooth in the two latter species.

Zoœcia arising directly from one another; no stolon; free statoblast oval Plumatella, p. 212. a'.